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SKF imported bearing failure form and design constraints
Jan 05, 2019

The common failure modes of SKF bearings are:

1, fatigue pitting

Practice has proved that with proper lubrication and sealing, when the installation and maintenance conditions are normal, most of the bearings will change the contact stress in the surface of the objects in contact with each other due to the rolling of the rolling elements along the ferrule. After a certain number of cycles, this is Stress causes microscopic cracks that do not form deep beneath the surface. Microscopic cracks are squeezed by the lubricating oil that has penetrated into it, causing pitting.

2, plastic deformation

Under the action of excessive static load and impact load, uneven plastic deformation pits appear on the rolling element or ferrule raceway. This happens mostly in bearings with very low or oscillating speeds.

3, abrasive wear, adhesive wear

SKF bearings are prone to abrasive wear when operating under unreliable and dusty operating conditions. Usually, there is sliding friction between the rolling element and the ferrule, in particular between the rolling element and the cage. If the lubrication is not good and the heat is severe, the rolling body may be tempered or even glueed and worn. The higher the speed, the more severe the wear.

In addition, due to abnormal installation, disassembly and operation, the bearing components may be damaged or the like, which should be avoided.

The design constraints that need to be met during calibration are mainly to avoid bearing failures to ensure that the bearings can work properly within the specified time limit. Generally, the bearing has different main failure modes under different working conditions. For medium-speed bearings, the main failure mode is fatigue pitting. The design constraint is to ensure that the bearing has sufficient fatigue life. It should be checked according to fatigue life. For high-speed bearings, excessive wear and burns are often caused due to large heat. In addition to ensuring that the bearing has sufficient fatigue life, the design constraint should also limit its speed not exceeding the limit value, that is, in addition to the life calculation, it must also check its limit speed; for bearings that do not rotate or have very low speed, The main form of failure is excessive plastic deformation. The design constraint is to prevent excessive plastic deformation, and the calculation of static strength is required.

In addition, the design of the bearing assembly structure should be reasonable, to ensure adequate lubrication and reliable sealing, which is very important to improve the life of the bearing and ensure normal operation.